Boat and propeller therefor.



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N. STIRN,

BOAT AND PROPBLLBR TEBREFOR.

APPLIGATION FILED APR 9, 1913 Patented Mar. 23, 1.915A

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FUCHUILAS SEHEN, 0F CHICAGG, IILLINOIS.

IBAT AND PROPELIJER TREFOR.

Specication ot Tbetters Patent.

Patented Mar. 23, lttll..

dpplieatton tiled .april 9, 191%. Ferial No. 759,900.

To aZZ lwhom, t may concern:

Be it known that ll, NICHOLAS SrnzN, a citizen of the United States, anda resident of the city of Chicago, county of Cook, and State ofllllinois, have invented certain new and useful improvements in Boatsand Propellers Therefor, of which the following is a specification.

My invention relates to improvements in boats and propellers and has forits object the provision of an improved boat and set of propellerstherefor whereby the power supplied to the propellers is utilized withgreat efficiency.

rlhe invention consists in the combinations and arrangements of partshereinafter dey scribed and claimed.

rl`he invention will be best understood by reference to the accompanyingdrawings forming a part of this specification, and in which- Figure l isa longitudinal section of a propeller embodying my invention, the boatto which the same is applied being indicated in dotted lines, Fig. 2, atop plan view corresponding to Fig; l, and Fig. 3, a rear end viewcorresponding to Fig. 2.

'lhe preferred form of construction as illustrated in the drawingscomprises two hollow water-tight cigar shaped bodies l. and 2 which arerotatably mounted at opposite sides of the boat, a little more thanone-half submerged in the water. These bodies carry on their peripherieshelical vanes 3 and t respectively, said values being oppositelydisposed as shown. Each of the bodies 1 and 2 carries at its rear end abevel gear 5 meshing with two bevel gears 6 which are loosely mounted ona shaft 7 extending across the rear of the boat. Arranged on shaft 7between each pair of bevel gears 6 is a clutch member of ordinaryconstruction which is splined to said shaft, said clutch members beingconnected for operation with the lower end of rods or levers 8 and 9 asindicated.' Shaft 7 is driven by means of a bevel gear l0 meshing with abevel gear ll mountedlon the lower end of a vertical shaft 12 arrangedat the stern/of the boat. Shaft 12 is driven by means of a bevel gear i3-meshing with a bevel gear lll secured to the end of the ordinary engineshaft l5 which is projected from the stern of the boat for this purpose.By this arrangement it will be observed that the bodies l and 2 may berotated and stopped or reversed as desired thus giving complete controlof the boat. By making the bodies l and 2 hollow and water-tight, theirbuoyancy is added to that ofthe boat and thus the boat is raised higherin the water which thus adords less resistance. lllhe helical vanes 3and l will act in substantially the same manner as augers and the waterwill thusoifer great resistance thereto and consequently effect theapplication of the power applied with great elhciency.

`While l have illustrated and described the preferred form ofconstruction for carrying my invention into effect, this is capable ofvariation and modification without departing from the spirit of theinvention. l, therefore, do not wish to be limited to the precisedetails of construction set forth, but desire to avail myself of suchvariations and modifications as come within the scope of the appendedclaim.

Having described my invention what li claim as new and desire to secureby lietters Patent is: l

The combination with a boat, of a hollow body rotatably mounted on eachside thereof; a shaft extending across the rear end of said boat; meansfor rotating said shaft; a bevel gear fixed to the rear end of each ofsaid bodies; a pair of bevel gears loosely mounted on said shaft andmeshing with opposite sides of each bevel gear on said bodies; a clutcharranged on said shaft between the members of each of said pairs ofgears; and a lever for shifting each of said clutches, substantially asdescribed.

ln testimony whereof l have signed my name to this specification in thepresence of two subscribing witnesses.

NICHOLAS S'lPlRN.

Witnesses:

JOSHUA R. H. Porre, HELEN F. LrLLIs.

